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Epithelial IL-6 response following in vitro infection with recombinant E. coli strains differing in fimbrial expression. Biopsies were infected with the P-fimbriated recombinant strain E. coli HB101(pPIL110-35) (pap+) (right panels). E. coli HB101 (pap) (left panels) was the nonfimbriated control. Magnification, ×200.
